Calculating Ionization Transition Rate for Circularly Polarized Fields, Including Non Zero Initial Momentum

V.M. Ristić, T.B. Miladinović and M.M. Radulović Department of Physics, Faculty of Science, Kragujevac University, Kragujevac, Serbia

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Potassium atoms in circularly polarized laser field whose intensity (I) varies from 2× 1012 W/cm2 to 2.5× 1014 W/cm2 were studied. In the case when there is zero initial momentum, transition rate (that depends only on I) exhibits standard behaviour: as I increases, so thus the rate, until it reaches its maximum value at 1.1× 1014 W/cm2; After that, rate diminishes as I increases. In the case of non zero initial momentum, transition rate (that now depends on I but additionally on initial momentum, too) exhibits following behaviour: dependence of the rate on I follows standard pattern, it rises with increase of I until it reaches its maximum, and then diminishes. But with increase of momentum, ionization rate gradually diminishes.

DOI: 10.12693/APhysPolA.116.504 PACS numbers: 32.80.-t, 32.80.Fb, 32.80.Rm